Tehran megacity, the political and economical capital of Iran with population of more than eight million residents, is situated in the seismically active zone of Alborz. Several large earthquakes such as the 855 A.D. Ms 7.1, the 958 A.D. Ms 7.7, and the 1117 A.D. Ms 7.2 in the historical seismic catalog of Tehran and surrounding area proves that the city has a high level of seismic risk. Mindful of the seismic risk faced by the city, the Tehran Rapid Response Network (TRRNet) has been installed in the Tehran metropolitan area in order to acquire real-time strongmotion data, to develop a strong ground motion database, and to improve microzonation as well as obtain effective information for the estimation of earthquake ground shaking and damage. This network consists of twenty strong-motion stations which have been established by the Iran Strong Motion Network (ISMN) department of Road, Housing and Urban Development Research Center in the frame of a pilot project for rapid assessment of ground-shaking parameters. peeqMap software developed by Sadeghi-Bagherabadi et al. (2010) is customized to be able to use the data obtained from TRRNet for mapping the distribution of peak ground acceleration (PGA) in Tehran. The peeqMap is able to extract the ground-motion parameters from recorded waveforms, and combine them with predefined seismological information (e.g., site effect factors and attenuation relationships) to determine the groundmotion maps at regional and local scales.

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